Semifinished Product, Method of Production and Use Thereof

Abstract

A semifinished product is disclosed and includes a high-quality, weather-resistant coating. Also disclosed is a method for manufacturing the semifinished product and the use thereof.

What is claimed is: 
     
         1 . A semifinished product, the semifinished product comprising a metallic core layer and a polymer coating with a formulation comprising from 5 to 70% by weight of hydroxy-functional fluoropolymers, from 5 to 70% by weight of polyesters based on di- or polycarboxylic acids or on derivatives of these and on aliphatic or cycloaliphatic di- or polyols, where at least one aliphatic or cycloaliphatic di- or polycarboxylic acid or derivatives thereof must be present in the polyester, from 2 to 25% by weight of crosslinking agents, from 0.01 to 2% by weight of crosslinking catalysts, up to 20% by weight of UV absorbers and up to 10% by weight of UV stabilizers, wherein a metallic anticorrosion layer has been provided to the core layer, and wherein the metallic anticorrosion layer exhibits cathodic protection from corrosion in respect of the core layer. 
     
     
         2 . The semifinished product as claimed in  claim 1 , wherein the core layer comprises at least one layer made of steel. 
     
     
         3 . The semifinished product as claimed in  claim 1 , wherein the metallic anticorrosion layer comprises zinc, aluminum, tin, magnesium or alloys of these. 
     
     
         4 . The semifinished product as claimed in  claim 1 , wherein the thickness of the core layer is from 0.2 mm to 4 mm and the thickness of the polymer coating, after drying and crosslinking, is from 0.5 to 200 μm. 
     
     
         5 . The semifinished product as claimed in  claim 1 , wherein the thickness of the metallic anticorrosion layer is from 1 μm to 200 μm. 
     
     
         6 . The semifinished product as claimed in  claim 1 , wherein the polymer coating comprises organic and/or inorganic pigments or dyes. 
     
     
         7 . A process for the coating of a semifinished product comprising the steps of:
 A. providing a metallic core layer   B. coating the metallic core layer with a metallic anticorrosion layer   C. applying to the coated metallic core layer a polymer coating with a formulation comprising from 5 to 70% by weight of hydroxy-functional fluoropolymers, from 5 to 70% by weight of polyesters based on di- or polycarboxylic acids or on derivatives of these and on aliphatic or cycloaliphatic di- or polyols, wherein at least one aliphatic or cycloaliphatic di- or polycarboxylic acid or derivatives thereof must be present in the polyester, from 2 to 25% by weight of crosslinking agents, from 0.01 to 2% by weight of crosslinking catalysts, up to 20% by weight of UV absorbers and up to 10% by weight of UV stabilizers; and   D. drying and/or calcinating of the polymer coating.   
     
     
         8 . The process as claimed in  claim 7 , wherein, after the application of the anticorrosion layer (step B) and the application of the polymer coating (step C), a heat-treatment is carried out. 
     
     
         9 . The process as claimed in  claim 7 , wherein the resultant coating is provided together with a further scratch-resistant coating, conductive layer, antisoiling coating and/or reflection-increasing layers or other optically functional layers. 
     
     
         10 . The use of a semifinished product as claimed in  claim 1  in vehicle construction, for packaging, for household equipment or in the construction sector for the construction of facades and of roofs, in the fitting-out of interiors and surface-finishing, and also in the design/construction of other metal structures. 
     
     
         11 . The semifinished product as claimed in  claim 2 , wherein the metallic anticorrosion layer comprises zinc, aluminum, tin, magnesium or alloys of these. 
     
     
         12 . The semifinished product as claimed in  claim 2 , wherein the thickness of the core layer is from 0.2 mm to 4 mm and the thickness of the polymer coating, after drying and crosslinking, is from 0.5 to 200 μm. 
     
     
         13 . The semifinished product as claimed in  claim 3 , wherein the thickness of the core layer is from 0.2 mm to 4 mm and the thickness of the polymer coating, after drying and crosslinking, is from 0.5 to 200 μm. 
     
     
         14 . The semifinished product as claimed in  claim 2 , wherein the thickness of the metallic anticorrosion layer is from 1 μm to 200 μm. 
     
     
         15 . The semifinished product as claimed in  claim 3 , wherein the thickness of the metallic anticorrosion layer is from 1 μm to 200 μm. 
     
     
         16 . The semifinished product as claimed in  claim 4 , wherein the thickness of the metallic anticorrosion layer is from 1 μm to 200 μm. 
     
     
         17 . The semifinished product as claimed in  claim 2 , wherein the polymer coating comprises organic and/or inorganic pigments or dyes. 
     
     
         18 . The semifinished product as claimed in  claim 3 , wherein the polymer coating comprises organic and/or inorganic pigments or dyes. 
     
     
         19 . The semifinished product as claimed in  claim 4 , wherein the polymer coating comprises organic and/or inorganic pigments or dyes. 
     
     
         20 . The semifinished product as claimed in  claim 5 , wherein the polymer coating comprises organic and/or inorganic pigments or dyes.